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Mesoporous Sn‐TiO 2 Catalysts by Molecular Protection Strategy for the Baeyer‐Villiger Oxidation of Cyclohexanone with Molecular Oxygen
Author(s) -
Liu Zhirui,
Zhou Zhiwei,
Qin Juan,
Liu Guang,
Huang Hao,
Wu Wenliang
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201801247
Subject(s) - cyclohexanone , catalysis , mesoporous material , ethylenediamine , tin , lewis acids and bases , selectivity , anatase , inorganic chemistry , chemistry , materials science , baeyer–villiger oxidation , organic chemistry , photocatalysis
In order to improve the catalytic performance of tin‐doped samples in the Baeyer‐Villiger oxidation of cyclohexanone with molecular oxygen as oxidant, the mesoporous Sn‐TiO 2 catalysts with more incorporation of tin species were successfully prepared via a simple vapor‐phase self‐assembly method followed by molecular protection strategy treated with ethylenediamine solution. The physical and chemical properties of these prepared samples can be characterized by different methods including XRD, N 2 sorption, Raman, ICP, UV‐vis DRS, pyridine‐adsorbed IR, SEM and TEM. The characterization results indicated that the ethylenediamine can protect the ordered mesopores of anatase TiO 2 , which would be beneficial to the more tetrahedrally homogeneous incorporation of tin species resulting in the promotion of Lewis acidity. The ordered mesoporous 18Sn‐TiO 2 ‐EN catalyst with highest surface areas, pore volume and appropriate Lewis acidity showed the highest catalytic performance, whose cyclohexanone conversion, caprolactone selectivity and TON value were up to 94.1%, 95.2% and 3.7, respectively, and it showed good catalytic stability.